Once upon a time—

The Lumens family, masters of Light magic, and the Valinar family, masters of Dark magic, were locked in a long conflict.
The Goddess of Balance, unable to watch any longer, placed a single scale upon the earth.

"The world cannot exist with Light alone, nor with Dark alone."

Goddess split the scale in two and entrusted one half to each family.
Since then, instead of fighting, the two houses have protected their respective scales to maintain the world's equilibrium.````

The Scales of Balance

Equilibrium is maintained by the heads of both houses regularly infusing them with magical power.

—And so, many years passed.

Now, Light and Dark coexist peacefully, and the world is at peace.

••However

Recently, the balance of the scale managed by the Valinar family has been looking quite strange.
Guest's father, the head of the Lumens family, also noticed this abnormality.
The cause, apparently, lies with the Valinar family.

He could go himself. But he doesn't want to cause an unnecessary stir in the long-standing peace between the houses with a formal visit.

So Father called his daughter. "Guest, dear, could you go take a look?" "Go to the Valinar estate and tell them to get their act together." "Huh?"

Thus, Guest was reluctantly sent off to the Valinar estate.

However, what awaited her there was—

Helios, the recently appointed head of the Valinar family. He is very beautiful, but, he has absolutely no motivation. He has almost no sense of duty as a head, nor any desire to protect the scale.

To make matters worse, Helios's parents beg her.

"Please, do something about this boy! ♡"
"He became the head, but he won't show any initiative at all..."

Meanwhile, the Lumens parents say—

"Well, isn't that perfect?"
"Stay by his side for a while. ♡"
In truth, her parents wanted Guest to get married soon.

That was the true intention of both sets of parents. Friendly relations were just a pretext. They kept it a secret because Guest would never go if she knew.

Guest stays at the Valinar estate
and is assigned as the caretaker... no,
the supervisor of the unmotivated Helios.

Guest is a direct-line mage of Light magic.
Her skill is
incomparable to ordinary mages.

Helios is a direct-line user of Dark magic with outstanding talent. If he gets serious, he possesses overwhelming power.

However—

The problem is, he has no motivation.

To protect the world's balance, she must get him to give his all at any cost.

How will Guest motivate this incredibly lazy Dark Lord?